How to choose the best welding jacket for both protection and comfort?

The dilemma between thermal protection and freedom of movement

The daily work of a professional welder is marked by countless small safety decisions. The choice of jacket is one of the most important decisions to make. Historically, the market was divided into two categories. On one side, 100% cowhide leather garments, offering an impenetrable thermal barrier but rigid enough to turn every movement into an effort while trapping body heat to the point of exhaustion. On the other, classic flame-retardant cotton, lightweight and breathable, but often insufficient against the heavy slag produced by arc or MAG welding.

The modern welder’s jacket must break away from this compromise. It must protect the torso, abdominal area and upper limbs while allowing total freedom of movement, which is essential for maintaining a consistent weld bead. Protection that is too heavy causes muscular fatigue and reduces alertness. Conversely, protection that is too light exposes the wearer to deep burns.

The Arc Knight range by Weldas was developed to occupy this technological “sweet spot”. By intelligently combining materials, it offers a solution where the safety of Class 2 armour meets the flexibility of a high-quality textile work garment.

Why Arc Knight innovation changes the game: Materials science

The innovation lies not only in the design, but also in the strategic assembly of textiles and hides.

The balance between flame-retardant cotton and split leather The Arc Knight range is based on high-performance grey cotton weighing 520 g/m². By comparison, standard flame-retardant workwear generally weighs around 300 to 350 g/m². This higher density gives the fabric exceptional dimensional stability and increased thermal inertia. To reinforce critical areas, Weldas integrates premium black split leather on the sleeves and abdomen. This split leather is specifically treated to resist heat-related hardening. The use of cotton on the back and flex zones allows metabolic heat to escape in a way that leather alone could never provide.

Performance and certification

EN11611 Class 2 Despite its reduced weight compared with “all-leather” equipment, the Arc Knight range achieves Class 2 of the EN11611 standard. This is a major technological breakthrough: achieving the same test result as a thick leather jacket while retaining the breathability of cotton. This means the garment can withstand extreme molten metal spatter conditions without compromising the integrity of the protective barrier.

Selection guide: Choosing your model according to the welding process

Not all welding tasks involve the same risks. Your jacket choice should reflect the reality of your workstation.

The 38-4350 model: Robust protection for intensive welding (MIG/MAG / MMA)

This model is the flagship piece for welders who are constantly exposed. Its hybrid design places black split leather on the sleeves and across the entire abdominal area.

• Target use: Manual metal arc welding (MMA) or MAG welding (semi-automatic) with CO2 gas, where spatter is frequent and heavy.
• Expert detail: Reinforcing rivets are positioned at each junction between cotton and leather. These points are areas of maximum tension during arm movements. The rivets mechanically prevent seam tearing, extending the garment’s service life by several months in industrial use.

The 38-4330 model: Modularity for versatile welding or TIG

For professionals alternating between preparation, assembly and welding, or for those practising TIG welding — a clean process with little spatter — the 38-4330 model is optimal.

• Design: 100% flame-retardant cotton, 520 g/m².
• Modular advantage: It features a row of snap buttons on the chest, allowing a leather chest apron to be attached instantly. This is the ideal solution for avoiding unnecessary leather during preparation phases, while still being able to “arm up” before moving on to a more aggressive welding phase.

Technical details: Ergonomics serving safety

A welding jacket is judged by the details that only become noticeable in difficult working conditions.

Double front closure system.

Unlike standard jackets that use either buttons or Velcro, Arc Knight uses both. The first layer is a wide Velcro strip, backed up by metal snap buttons. Why? Because in a lying or side welding position, the fabric bends. A single closure could gape open, allowing a spark to pass through. The double closure creates a labyrinth-like “seal”. It is also a redundant safety feature: if the Velcro becomes clogged with metal dust or if a button breaks, the protection remains closed.

Collar ergonomics and cuff adjustment 

The collar is high and closes with adjustable Velcro. It is designed to interface perfectly with the base of the welding helmet, thereby protecting the throat and carotid arteries against UV rays. The cuffs are also adjustable. This feature is vital for reducing the sleeve diameter and allowing the welding glove cuff to cover the jacket without creating an uncomfortable bulge or an opening for slag.

“Protection that leaves no room for doubt, designed so that sparks never find a path to the skin.”

Understanding EN11611 Class 2: The expert standard

For a technical buyer, the mention “Class 2” is much more than a label; it is a rigorous testing protocol.

The difference between Class 1 and Class 2

• Class 1: Protects against light welding techniques that produce little spatter (TIG, micro-plasma). It requires the fabric to withstand the impact of 15 droplets of molten metal without the inner temperature increasing by 40°C.
• Class 2: This is the level required for manual MAG welding — with CO2 or gas mixtures — MMA welding with basic or cellulosic electrodes, and oxy-cutting. Here, the garment must withstand 40 droplets of molten metal.

Construction requirements 

To be certified, the garment must follow a precise construction geometry:

1. Downward-facing seams: No seam should form a “shelf” where a spark could settle and burn the thread. Everything is assembled so that metal slides off by gravity.
2. Secure pockets: Pockets must have flaps that are wider than the opening — by at least 20 mm on each side — to prevent spatter from entering from the sides.

Beyond the jacket: A systemic approach to protection

Safety does not stop at the torso. The Arc Knight range offers specific solutions for every role in the workshop.

The Lab Coat or welding coat (38-4350/C) 

This is a long garment extending down to the knee. It is particularly intended for workshop managers, quality inspectors or engineers. It provides full protection without requiring a trouser/jacket set.

• Distinctive detail: It features black leather pocket flaps, highlighting the premium look of the range while protecting areas where dust can accumulate.

The bolero or cape sleeve (38-4328) 

The bolero protects the shoulders and arms while leaving the back open.

• Thermal advantage: Ideal in summer or in very hot confined environments to avoid the “sauna effect”.
• Working at height: This is the preferred solution for welders wearing a safety harness. A traditional jacket back under a harness creates painful folds and traps dangerous heat. The bolero can be worn over or under the harness without obstructing access to the rear anchorage point.

Trousers (38-4360) and bib overalls (38-4380) 

For the lower body, 520 g/m² cotton is the standard.

• The 38-4360 trousers: Feature secure pockets and compartments for knee pads, essential for welders working on the ground.
• The 38-4380 bib overalls: They offer superior comfort thanks to elastic shoulder straps and an elasticated back panel for precise anatomical adjustment. Side zips, protected by Velcro flaps compliant with the EN11611 standard, allow quick dressing. A major practical detail: an opening at the bottom of the legs allows the garment to be removed without taking off safety shoes.

Focus on accessories: Aprons and breakaway safety

The apron remains the key tool for managing equipment service life.

The welding apron (38-44) This hybrid cotton/leather model is a cornerstone of workshop economy. By placing a leather insert over the abdominal area, it protects the jacket — a more expensive garment — against repeated abrasion on the workbench.

• Back comfort: Unlike basic aprons that put weight on the neck, the 38-44 features an intelligent split fastening system at the back. The weight is distributed over the shoulders, reducing neck pain at the end of the day.
• Visibility: The red straps are flame-retardant and make it easy to quickly identify the correct adjustment.

Buckle safety Weldas uses flame-retardant plastic buckles. Unlike metal fasteners, which could resist and pull the welder along if the apron became caught in a roller or rotating machine, these clips are designed with a calculated resistance to break in the event of violent tearing. This is an essential passive safety feature in mechanised workshops.

Maintenance, longevity and outlook

To make an investment in Class 2 equipment worthwhile, maintenance is essential. The 520 g/m² flame-retardant cotton withstands washing well, but bleach and fabric softeners must be avoided, as they could alter the chemical properties of the flame-retardant treatment. Split leather should be dry-brushed to remove metal dust which, through oxidation, could weaken the hide.

Since 1984, Weldas has established itself as the choice of professionals by listening to real-world field requirements. The Arc Knight range is the result of this approach: it proves that maximum protection no longer has to be a physical punishment for the worker.

Is your current equipment truly adapted to your daily risks? If you experience excessive fatigue, abnormal sweating or if your current garments show burn-through marks after only a few weeks, switching to a hybrid Class 2 solution is the logical next step.